Temper-screw clamp.



UNITED STATEs PATENT @l hlillis PATRICK II. MACK, on BRADFORD,PENNSYLVANIA, ASSIGNOR TO THE oIL WELL sUPPLY COMPANY, on PITTSBURG,PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

TEMPER SCREW CLAlVi P.

SPECIFICATION fomiing part of Letters Patent No, 696,829, dated April 1,1902.

7 Application filed January 31, 1901 Serial No. 45,454. (No model.)

To ctZZ whom it may concern.-

Be it known that I, PATRICK I-I. MACK, a citizen of the United States,residing at Bradford, in the county of McKean, State of Pennsylvania,have invented certain new and use- :ful Improvements in Temper-ScrewClamps; and I hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdraw- 10 ings, in which- Figure l is a View in elevation of the lowerportion of a temper-screw provided with a drill-cable clamp embodying myinvention, showing the connection between the temperl5 screw andtemper-screw clamp. Fig. 2 is a vertical central section of the clamp,showing the sinuous grip or cablegroove of the clamp; and Fig. 3 is atransverse section on the line 3 3, Fig. 2.

Like symbols refer to like parts wherever they occur.

The object of my present invention is the production of a simple andefficient clamp for connecting the drill-cable with the temperscrew usedin drilling oil and Artesian wells.

In the drilling of deep wells the drill-tools, drill-cable, &c., willweigh several thousand pounds, which weight is carried by thetemper-screw and must through the drill-cable be so connected with thetemper-screw as to be readily detached to permit of the withdrawal ofthe drill-tools and the use of the bailer and sand-pump. Moreover, thecharacter of the clamp must be such as will prevent any slipping of thedrill-cable-a thing difficult to accomplish in view of the'constant liftand drop of the load, the jar due to the stroke of the drill, and thetendency of the cable to elongate, especially if the same be of 0 manilaor vegetable fiber, or to out out the clampif a wire cable be used.

l-Ieretofore several forms of clamp have been devised to eifect thepurpose desiredas, for instance, the ordinary plain or smooth boresectional clamp with which a cone wrapping upon the cable above theclamp is used, straight-bore clamps with inserted wedges forcedinwardby-set-screws to clamp the drillcablc, and clamps having spiralcorrugations within the bore corresponding to the strands of the cableto enter into and between the strands of the cable-all of which haveproved more or less inefficient (and especially so in the case of wireropes) by reason of the wear upon the cable or the destructive cuttingof the gripping-faces of the clamp due to the slipping of the cable inthe clamp.

To overcome the several objections hereinbefore pointed out and securean efficient clamp, I construct the clamp of longitudinal sectionshaving on their interior a plain ropeseat formed of'a series of reversecurves, said curves being equal and oppositely placed on the coactingsections of the clamp, whereby the rope is repeatedly and reversel ydeflected 6 5 from a right line and held as in snubbing, and such aconstruction embodies the main feature of my invention.

The clamp-sections having the sinuous grip comprised of reverse curvesequal and oppo- 7o sitely placed upon the several sections-arepreferably link-suspended from the temperscrew and are closed by meansof a clampyoke detachably connected with one clampsection, which,together with other features of construction, that will hereinafter morefully appear, constitute other and minor features of my invention.

I will now proceed to describe my invention more fully, so that othersskilled in the art to whichit appertains may apply the same.

In the drawings, A indicates a portion of the frame or reins of thetemper-screw, by means of which the same is attached to thewalking-beam; A, the screw; 13, the swivelbar of the temper-screw, and Ca sectional rope-clamp embodying my invention, the same being flexiblyconnected with or suspended from the swivel-bar U of the temperscrew bythe links 0 c or in other suitable 9o manner.

The clamp C, which embodies my invention, is preferably composed of twolongitudinal sections 1 and 2, which may be of any suitable material,but in order to obtain the 5 best results should be composed of theouter portions or shells 1 2, of iron, and the inner portions, bushings1 2 of Babbitt metal or its equivalent, of a more ductile character thaniron, and therefore better adapted to secure a conforming friction-gripon the drillcable. Each of said longitudinal clamp-sec tions 1 and 2 issuspended from the swivelbar of the temper-screw by a link 0 orequivalent means, which will permit the sections to swing apartlaterally to release the rope or drill-cable When the clamp-yoke isloosened.

The interior of each of the clamp-sections 1 and 2, whether of iron,Babbitt, or other suitable metal, is provided with a rope-seat for thereception of the drill-cable D, said seat being smooth and arc-shaped incross-section, (see Fig. 3,) but sinuous from end to end, orlongitudinally-that is to say, formed with a series or plurality ofreverse curves 3 4 5 6 3 4H 5 6*, &c., within the body of the clamp,said curves being equal and oppositely placed on the respectiveclamp-sections l and 2, so that the rope or drill-cable when grippedbetween the sections will be reversely forced from a right line at aplurality of points within the clamp and will assume a sinuous directionmade up of a series of curves, which curves, though as a whole less thana complete circle or hitch, will, by their number, effectually snub therope and hold it rigidly against movement in or through the clamp.

7 indicates a clamp-yoke, preferably of C form, which may be detachablyconnected with one section of the clamp 1 by means of the set-screw 8 orin other suitable manner, the opposite clamp-section 2 being providedwith a plate 9 or its equivalent, against which the inner end of thehand-screw 10 of the clamp-yoke bears, said hand-screw 10, together withthe yoke, being the preferred means by which the clampsections 1 and 2are forced together and caused togrip the drill-cable D,

As before noted, the clamp-sections l and 2 may be formed integral orwithout the lining or bushing 1 2, if desired, but are preferablyprovided with Babbitt metal or a similar lining or bushing, in whichcase the shell will be formed and the lining or bushing insertcd byfirst shaping up the shells'by dropforging under dies, (or a suitablemetal casting may be used,) subsequently inserting a suitable sinuouscore and sinuous divisionplates between the shell-sections thus formed,the same being clamped and held between the shell-sections, and finallycasting the Babbitt metal or other bushing in the cavities thus formedbetween the shell-sections and the sinuous core and division-plates.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A rope-clamp for temper-screws, comprising a plurality oflongitudinally-separable clamp-sections having a sinuous rope-seattherein made up of a series of reverse and equal curves oppositelyplaced in the coacting clamp-sections, substantially as and for thepurposes specified.

2. A rope-clamp for temper-screws, comprising a plurality oflongitudinally-separable sections each section having an outershell anda bushing, the bushings of the clamp-sec-' tions provided with sinuousrope-seats made up of a series of reverse and equal curves oppositelyplaced on the coacting clamp-sections, substantially as and for thepurposes specified. V

3. The combination with a temper-screw, of a rope-clamp comprisinglongitudinally-separable sections, provided with a sinuous ropeseattherein, said rope-seat having a plurality of equal and reverse curvesoppositely placed in the coacting clamp-sections, flexible connectionsbetween the clamp-sections and the swivel-bar of the temper-screw, andmeans for confining the coacting clamp-sections, substantially as andfor the purposes specified.

In testimony whereof I atlix my signature, in presence of two Witnesses,this 26th day of December, 1900.

PATRICK ll. MACK.

Witnesses:

R. G012, W ALTER 13. SHAW.

